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ammi-sheen., J. L. L. KNOX.

Grate for Furnaces of Steam' Boilers. No. 229,319. Patented June29.18180.

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G-ragtefor Furnaces 'Q f""Stea;m` Boilers.

No. "229,319. Patented June 29, 1880.

. WJTNESSES.- NVE/V701? NAPETERS. PHcIG-LITHOGRAPHER, WASHINGYON. D. C.

UNITED STATES PATENT OFFICE.

JOHN L. L. KNOX, OF ALLEGHENY, PENNSYLVANIA.

GRATE FOR FURNACES OF STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 229,319, dated June 29,1880.

Application filed April 29, 1880.

To all whom it may concern:

Be it known that I, JOHN L. L. KNOX, of Allegheny, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Grates for Furnaces for Steam-Boilers; and I do herebydeclare that the following is a full and exact description thereof,reference being had to the accompanying drawings, and to the letters ofreference marked thereon.

My invention relates to an improvement in grates for furnaces forsteam-boilers; and it consists in constructing the grates in detachablesections and pivoting them in a frame furnished with detachable barsarranged transversely in said frame, said grate-sections consisting of aseries of bars attached to the upper side of avtransverse detachablesupporting bar, constructed in two parts, with a sleeve-trunnion at eachend tted to detachable bearings and braced through the medium of acurved rod, (commonly called a hogf chain,) and connected by detachablerods, for imparting an oscillatory motion to them and the bars supportedthereon, the ends of which lock into each other, and thereby form a firmgrate-section, the whole being so constructed, combined, arranged, andoperating that the area of air-surface under the fire on thegrate-sections is more than the area of the grate-bars upon which theiire rests, and the accumulation of ashes upon the bars avoided, therebyadmitting an ingress of air suflicient to protect said bars fromburning, and also insure complete combustion of the fuel, which may beagitated by the oscillation of the grate-sections, at the will of theoperator, for rupturing the incrusted or conglutinated fueln To enableothers skilled in the art with which my invention is most nearlyconnected to make and use it, I will proceed to describe itsconstruction and operation.

In the accompanying drawings, which form part of my specification,Figure] is a top view or plan of my improvement in grates for furnacesfor steam-boilers. Fig. 2 is a vertical -andlongitudinal section of thesame at line a: of Fig. l. Fig. 3 is a vertical and transverse sectionof the same at line y of Fig. 1. Fig. 4 s

is an end View of the same, representing the (No model.)

of the same, representing the grate-section tilted. with portions of oneside of the grateframe broken away. Fig. 6is a top view of thedetachable cross-bar of the frame for the grate. Fig. 7 is an end Viewofthe same. Fig.. 8 is a side view of one of the bars which form thegrate-section. Fig. 9 is an end view of the same. Fig. 1() is a sideview of the transverse detachable supporting-bar for the grate-sections.Fig. 11 is an end view of the same. Fig. l2 is a face view of thedetachable bearings for the trunnions of the transverse detachablesupporting-bar for the grate-sections. Fig. 13 is a detail view of thatpart of the grate-frame to which the detachable cross-bar is attached,and Fig. 14 is a vertical section of the same.

In the accompanying drawings, A represents the frame for the grate,which is constructed in two or more sections, B, by the linien of aseries of grate-bars, l, the ends of which are locked together by meansof the side projections, m, of one bar being placed in a correspondingrecess, n, in the next bar, as shown in Fig. 4, said grate-bars L beingsupported on a detachable supporting-bar, D, to which they are attachedby means of the dovetail pendant o, which is placed between the twohalves i and j of the supporting-bars D.

On each side of the grate-bars l, at their y center,areprojectingseparating-piecesp,which terminate in aconiforin point. Onone of these separation-pieces is a projection, r, which is fitted to arecess made in the other separatingpiece. This projection andcorresponding recess in the separating-piecesp is of advantage inpreventing longitudinal movementof the bars l, in arranging them forforming a gratesection, by holding the dovctail pendants o parallel witheach other, thereby enabling the construeter to attach thesupporting-bar to the grate-section with more facility than he could doin case of the absence of said projection r and its correspondingrecess. This projection and recess in the grate-bar l is not anessential feature of the bar, which may or may not be used,.as deemedbest by the manu- Ioo at s t in Fig. 7. On each of the Adetachablesupporting-bars D is a trunnion, o, divided vertically, one-half thetrunnion being on each parti and j of the supportin g-bar D. Thetrunnions u are provided with a sleeve, 1c, which holds the two parts ofthe trunnion firmly together, as clearly shown in Fig. 11. From thelower edge of the parts i and j of the detachable supporting-bar Dproject pendants no y', recessed at a', which pendants are united, asshown in Figs. 2, 3, 10, and 11, when the two parts z' and j are placedin juxtaposition, as shown in Fig. 1. When the parts t' and j of thedetachable supporting-bar D are clamped together by tongued projections,such as s t, (see Fig. 7,) with the pendants o and bars Z between themand sleeves fw placed on the trunnions o, the supporting bar D is thenbraced by the curved bar b, which is tted in the recess a of thependants y', and the ends of it secured to the ends of thesupporting-bar D by screw-bolts c, as indicated in Fig. 3.

The section B of the grate is then ready to be pivoted in the frame A,which is accomplished by placing the trunnions n in the opening cl ofthe detachable bearing-plates e', having beveled edges f', whichbearing-plates are then placedin recesses in the frame A correspondingto the form of said plates, as shown in Fig. l. The sections B of thegrate having been pivoted in their frame A, as indicated in Figs. 1, 2,3, 4, and 5, the different sections of the grate are coupled by means ofconnectingrods g' h, which are furnished with hook ends, which hook onthe curved braces b, the forward end of the connecting-rod h beingpivoted to an angle or L lever, 7a', at i', which lever is pivotedto-the frame A at j', as shown in Figs. 2 and 3.

rlhe arm Z of the lever 7c is provided with a socket, m', for thereception of the end of a lever for operatin g the lever 7c and theparts attached thereto.

The detachable transverse bars n a are locked together by means of thetongued projections s t, and the projections r on the ends of said barsare fitted to recesses o", made in the frame A. `(Shown in Figs. `l, 13,and 14.)

The projections p (j ust below said recesses 0') on the inner walls ofthe frame A enter the space between the transverse bars it u and aid insupporting them in the frame.

The sides u of the transverse bars a n are curved, as shown in Figs. 2and 7, andthe projections w on theinner walls of the ends ofthe frame Aare also curved, as indicated inFig. 2. These curvatures are made forthe purpose of keeping the ends of the bars l of the grate-sections Bthe same distance from said projections w and bars n n when vibratingthe gratesections B, for it will be observed that by the agitation ofsaid grate-sections they have a compound movement-to wit, a vibratingand longitudinal movement, the latter a slight one, but sufficient togive a drawing or creeping action to the grate-surface, which, combinedWith the vibration, eft'ectually cleans the whole surface of thegrate-section from all refuse of combustion, and at the same time breaksup the mass of fuel resting upon the grate. This compound action of thegrate while agitating it is due to the fact that the bars l of thegratesections rest upon the detachable supportingbars D, the axes of thetrunnions of which are considerably below the top edge of said bar andvery much below the surface of the grate-` sections B.

It will be observed that the upper edge of the bars l of thegrate-sections B are circular when viewed in cross-section, (showninFig.3,) which form prevents the accumulation of ashes in the bars,and at thesame time gives afreeinlet of air, which prevents the burning of thebars and insures complete combustion and consumption of the fuel.

[t has been a matter of' observation that grate-bars in furnaces, aftertheir top edges have become rounded by use, last longer, and thatthe-lire of the furnace is more efficient, and th at the consumption andcombustion ofthe fuel are more perfect and complete, than when said barswere first placed in the furnace; yet this suggestive fact has neverbeen utilized prior to the date of my invention. K

The operator, when he desires to agitate the re on the grate-sections B,places a bar or lever in the socket m of the lever 7c', and by avertical reciprocating movement of said bar or lever will, through themedium of the lever k and coupling-rods 71. g', impart to thesupporting-bar D and the grate-sections B a vibratory motion, which willeftectually agitate. the burning fuel 'resting thereon, and at 4the sametime clean the bars lfrom ashes and other refuse of combustion.

The grate hereinbefore described may be adapted to any of the knownforms of furnaces, hre-places, and stoves without departing from theessential features of my invention.

The sleeves w on the trunnions o of the supporting-bars D and thedetachable bearingplates may be readily replaced in case of wear,whereby about the same plane of grate may be always had, which is a verydesirable thing in a furnace, the plane of the grate being alwaysarranged with relation to the other elements of construction of thefurnace.

Having thus described my improvement, what I claim as of my inventionis 1. The combination of the frame A, provided with detachabletransverse bars a u', the grate-sections B, attached to detachablesupporting-bars D, pivotedin detachable bearings e', and operatedthrough the medium of a lever, 7c', and coupling-rods g 7L',substantially as herein described, andfor the purpose set forth.

2. The frame A, the ends of which are provided with inward-curvedprojections w and detachable transverse bars a n', the sides of whichare curved, in combina-tion with the grate-sections B, constructed andpivoted substantially as herein described, and for the purpose setforth.

3. The detachable supporting bearing-bar D,

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constructed in two parts with pendants, and 5. The detachable transversebars n', probraced by a. curved bar, b, and furnished With vided Withthe projections r and tougued protrunnions l1,inc21sed in sleeves w,substantially jections s t, iu combination with the frame A, as hereindescribed, sind for the purpose set provided with the recesses o' andprojections 5 forth. p', substantially as and for the purpose herein 154. The grate-bars Z, the ends of which are 'shown and described.provided with a recess, n, and projection m, JNO. L. L. KNOX- furnishedwith pendants o and separa-ting- Witnesses: pieces 1o, substantially asherein described, and A. C. JOHNSTON,

1o for the purpose set forth. JAMES J. JOHNSTON.

